Please put a Turing complete tag on this. I was on the train and when I played this I had to start furiously processing. Everyone else gave me strange looks and were saying things like "what the towerquest" and "call the sysadmin". I dropped my Let's note DVD and everyone around me saw this level. Now there is a whole train of Turing machines computing together at this one level. This is all your fault, you could have prevented this if you had just tagged this post Turing complete.
To play this, you need to download TowerGame.